Brake



July 2,3 1935 l.. LA BRIE 2,009,112

' BRAKE Original Filed Aug. 30, 1929 INVEN TOR. 0055/? 5 HBR/E A TTORNEY Patented July 23, 1935 PAT-ENT orrice n BRAKE Ludger E. La Brie,V South Bend, Ind., assignor to .y Bendix Aviation Corporation,ASouth Bend, Ind.,

v la corporation of Delaware Original application August 30, 1929, Serial o. Divided and, this application 1932, Serial No. 625,137 Y Y f July27,

comme. (c1. iss-78V@ This invention relates to brakes and is illustrated as embodied in an internal expanding automobile brake of the full-wrapping type in which the friction-*means anchors atone end when the drum is turning in one direction and at the other end when the drum is turning in the other direction...

Anlobject of the invention is to improve both the operating and anchoring means of the brake 1o.- and to facilitate its adjustment.

- Preferably the brake includes operating means such as a toggle arranged in a plane parallel with the plane ofthebrake and which is operable by a iieXible tension element connected thereto. The toggle operating means which is preferably arranged at one side of the brake serves toexpand the separated .ends of .an annular friction element, which ends are adapted to anchor respectively through a movable link placed in tension and a stamping such as an angle iron rigidly l securedV tothe brake support. Thusin one directionof drum rotation the braking torque is taken bythe tension means and with the reverse direction of rotation the xed abutment takes the 2:,v torque.

1A further object of the invention resides in the provision of a novel adjustment for the friction.

element `disposed at one end thereof and which adjustment comprises relatively movable juXtaposed plates, the relative position of which is determined by a laterally movable Wedge mem-k ber'adapted to abut bevelledportions at the ends.

of slots inthe respective plates, thereaction of the wedgemember in forcing the plates apart 351 being taken by a cup-shaped washer member abuttingY one of said plates. Y Other objects and features of the invention, including'an indicating means cooperating with the aforementioned washer for indicating tothe opiolv erator the position of the adjusting means; also a novel arrangement of eccentric adjustable stops. for-'determining the idle position of the brakeg' and various other details of construction and combination of parts which will become apparent from thefollowing description of one illustrative embodiment of the invention Vshown in the ac# companying drawing, in which:

Figure l is a vertical section through the brake just vinside the head of the brake drum, and showing the brake friction means in side elevation; r

Figure 2'is a partial transverse section,'on the line 2-2 of Figure .1, through the`novel adjustment-of the brake; and y 555 Fig-niiet? is a partial section, taken on theline erably arranged at the front of the brake, that 3 3 of Figure ljshowing invdetail the anchoring structure for Vone end of the brake.

In the illustrated and preferred embodiment of the invention, the brake includes a rotatable druml l@ at the open side of Whichis a support such 5 as a backingrplate. IZand within.; which is arranged the friction means of the brake, preferably comprising a oating device such as an eX- pansible exible band Ill provided on its rim facer in the form shown with friction lining I6 riveted 10 or otherwise secured thereto.

Theidle position of the band lll with the brake released is. determined by novel adjustable stops suchvas disks i8 eccentrieally secured to pins 2i) secured to the backing plate, the disks contacting the inner face of the band ,it and when rotated serving .to force the same outwardly to determine 'the released position of the band under the actionof springs .22 and 24. Three such eccentrics are 1employed one each. at the ends of the band and -onepositioned substantially diametrically opposite the opening between the band.

The band lli is separated to contact the rotating drum by means of a novel toggle pref- 25 is, at one end of a horizontal diametrical line inthe left front brake disclosed in Figure l. The toggle may consist of links 26 and 28, each link comprising parallel stampings pivotally connected at their adjacent knuckle ends and ar-Y ranged to be actuated by a tension link Sii pivotally secured to the knuckle and at its other end to a vertically extending applying lever 32 fulcrumed to a pinv 3d rigidly secured to the backing plate l2', which lever is preferably actuated by a flexible tension element 36 pivotally secured thereto and extending through the plate l2 to be connectedto the service pedal'or other power source. l v

Thevlink 26 of the toggle is pivotally connected to a pin 38 (Figure 3) passing through a reinforcingweb it rigidly secured to'one end of theA band i4. With the wheel rotatingY in the direc@ tion of the arrow in Figure l (that isfwith the vehicle moving forward), the torque of the band is taken directly on pin 38 upon which are pivotally mounted'parallel anchoring tension links 42 pivotally secured at their ends to an anchor pin to. rigidly secured to the support plate l2. The

. anchor links are preferably. slotted at i6 to per-Y to Vpermit this reverse movement.- `This par- 55 5 the same from outsidethe brake.

ticular type of tension link anchor is more particularly described and claimed in co-pending applications of Roy S. Sanford No. 338,348, filed August 25, 1929, and Humphrey F. Parker, No. 381,195, filed July 26, 1929. Relative to this structure, it is to be noted that the eccentric adjustment pin 25 -is passed through reinforcing plates 5i. secured to the backing plate at the anchor pin 44.

According to another feature of my invention, which forms subject matter described and claimed in my parent application No. 339,556, filed August 30, 1929, of which this application is a division, the overall length of the band between its connections to the toggle links may be increased by an adjustment structure to compensate for the Wear of the friction lining, thus preserving the relative angularity of the links of the toggle and their position with respect to the remainder of the actuating mechanism. This particular construction, as more completely disclosed in Figure 2, may preferably comprise a relatively short radially extending .web member52 welded or otherwise permanently secured to the inner face of the band i4 at its lower end (Figure 1). A similar plate 54 substantially co-extensive in length with said plate 52 is preferably mounted parallel and in juxtaposition therewith and relatively movable thereto by means of pins 56 fixedly secured to the plate 52 and passing through slots in the plate 54. These pins which are provided with washers 58 slidingly contacting the sides of the plate 54 provide a slightly loose fit to permit the relative sliding movement of the two plates to effect the desired adjustment. This adjustment may be effected by a wedge-shaped member 60 threadedly mounted on the end of a set screw 62, the hex head of the latter positioned opposite an opening 563 in the backing plate to permit rotation of The faces of the wedge may preferably abut beveled portions G5 and 58 formed by pressing toward the backing plate the body of the plates 52 and 54 at the ends of superposed rectangularly shaped slots therein to accommodate the wedge. A cup-shaped washer member 59 rectangular in peripheral outline may be provided with a circular opening to accommodate the headed end of the set screw 62, one side of the washer adapted to contact with the inner face of the band, as shown in Figure 1, to obviate turning movement of the washer.

In order to indicate to the operator the degreey of angular movement of the set screw in effecting the adjustment, there is provided a circular washer member 'lli having a polygonal shaped opening adapted to surround a correspondingly shaped shoulder on the set screw, which washerV element by the operator serves to apply the lever and upon release of the power actuated mechanism the return springs Within the brake serve to withdraw the band from the drum into contact with the aforementioned adjustable stops. With continued service of the brake and its consequent lning wear, it becomes necessary to increase the overall length of the band which is readily effected by the manual adjustment of the set screw 62 to relatively move the plates 52 and 54. The positioning of the toggle parts in the plane of the brake permits of relatively long links forming the same, which reduces to a minimum the flattening of the toggle to effect the brake application. This is particularly desired, inasmuch as the pressure applied at the ends of the toggle links is a rst derivative of the angularity of the links during the spread of the same.

While one` illustrative embodiment of my invention has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment or otherwise than by the terms of the appended claims.

This application is a division of co-.pending application Serial No. 389,556 led August 30, 1929.

What is claimed is:

1. A brake comprising, in combination, a rotatable drum, a floating friction device within the drum, a fixed abutment at one side of the drum adapted to take the torque of said friction element in one direction of drum rotation, a link member at the upper side of the drum adapted to be tensioned to take the braking torque in the other direction of drum rotation and a toggle connected to said band intermediate said torque-taking means and arranged to expand the band to apply the brake.

2. A brake comprising,.in combination, a drum, a fixed abutment on one side of the drum, a oating expansible band within the vdrumhaving said abutment between its ends and arranged tohave one end anchor against said abutment when the` drum is turning in one directon'and to Vhave the` other end anchor against a link placed intension when the drum is turning in the other direction, together with a toggle arranged in the plane of the brake and connected to the ends of said band adjacent the aforementioned torque-taking meansV and which toggleY is arranged to apply the band into drum contact.

3. Abrake comprising a shoe havingaweb, a thrust link, a pivot pin connecting said thrust link to 'said web, an anchor link having aslot engaging said pin at one end, and an anchorpivot at the other. 1

4. A brakecomprising, in combination with a drum, a backing plate'at the open side of the drum, friction means within the drum having spaced ends and anchoring at one of said ends when the drum is turning in one direction and at the other of said ends when the drum is turning in the other direction, a lever within the drum and pivoted on'the backing plate between saidV spaced ends, a simple lever wholly Within the drum and pivoted on the backing plate between said ends and operatively acting on said ends and which extends upwardly valong one side ofA the backing plate, and a generally horizontal, op-

erating cable extending through the backing plate and connected to said lever at its upper end, said cable and lever forming substantially a right.

angle and being arranged for eincient use of the space enclosed by the brake drum and backig plate.

6. A brake comprising, in combination with a drum, a backing plate at the open side of the drum, friction means Within the drum having 10 spaced ends, a lever Within the drum and pivoted on the backing plate between said ends and operatively acting on said ends and which extends upwardly along one side of the backing plate, a generally horizontal operating cable extending through the backing plate and connected to said lever, and anchorage means for said ends permitting them to shift under load, when the brake is applied, radially of the drum. 

